nvme: allow unprivileged passthrough of Identify Controller

Add unprivileged passthrough of the I/O Command Set Independent and I/O
Command Set Specific Identify Controller sub-command.

This will allow access to attributes (e.g. MDTS and WZSL) that are needed
to effectively form passthrough I/O to the /dev/ng* character devices.

Signed-off-by: Joel Granados <j.granados@samsung.com>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

drivers/nvme/host/ioctl.c

@@ -34,6 +34,8 @@ static bool nvme_cmd_allowed(struct nvme_ns *ns, struct nvme_command *c,
 			case NVME_ID_CNS_NS:
 			case NVME_ID_CNS_CS_NS:
 			case NVME_ID_CNS_NS_CS_INDEP:
+			case NVME_ID_CNS_CS_CTRL:
+			case NVME_ID_CNS_CTRL:
 				return true;
 			}
 		}